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KB-280

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Copyright (c) Yamaha Corporation. All rights reserved. PDF

’06.02

SERVICE MANUAL

HAMAMATSU, JAPAN

CONTENTS

SPECIFICATIONS ................................................................. 3
PANEL LAYOUT .................................................................. 4
CIRCUIT BOARD LAYOUT & WIRING ................................ 6
DISASSEMBLY PROCEDURE ............................................. 8
LSI PIN DESCRIPTION ....................................................... 14
IC BLOCK DIAGRAM ......................................................... 16
CIRCUIT BOARDS .............................................................. 17
TEST PROGRAM ............................................................... 26
INITIALIZATION ................................................................. 29
MIDI IMPLEMENTATION CHART ..................................... 30
MIDI DATA FORMAT ......................................................... 31
PARTS LIST
BLOCK DIAGRAM
OVERALL CIRCUIT DIAGRAM

PK

001758

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Summary of Contents for PORTATONE KB-280

Page 1: ...AN CONTENTS SPECIFICATIONS 3 PANEL LAYOUT 4 CIRCUIT BOARD LAYOUT WIRING 6 DISASSEMBLY PROCEDURE 8 LSI PIN DESCRIPTION 14 IC BLOCK DIAGRAM 16 CIRCUIT BOARDS 17 TEST PROGRAM 26 INITIALIZATION 29 MIDI IMPLEMENTATION CHART 30 MIDI DATA FORMAT 31 PARTS LIST BLOCK DIAGRAM OVERALL CIRCUIT DIAGRAM PK 001758 ...

Page 2: ...roduct owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service representative IMPORTANT This presentation or sale of this manual to any individual or firm does not constitute authorization certifi cation recognition of any applicable technical capabilities or establish a principal agent relationship of any form The data provided is belived to ...

Page 3: ...KB 280 3 SPECIFICATIONS ...

Page 4: ...4 KB 280 PANEL LAYOUT q w 9 0 1 2 3 4 5 e y r t u i Front Panel A A ...

Page 5: ...KB 280 5 032 116 032 116 6 6 8 9 7 u i 6 7 8 9 0 1 2 3 4 o 0 4 5 6 7 8 1 2 3 Rear Panel A A ...

Page 6: ...per case side Upper case side DMLCD AM AMJK 1 6 PNR PN 3 6 AM AMJK 4 6 PNL PN 2 6 PNR PN 1 6 PNL PN 4 6 PB AMJK 6 6 AM 61H 61L AMJK 5 6 MIDI AMJK 2 6 TWL PN 5 6 6 6 TWR PN 5 6 6 6 Speaker R Upper case assembly Speaker L t w r 1 2 6 7 y 3 5 q e o u t 8 4 i 0 1 2 ...

Page 7: ... DMLCD CN403 DMLCD CN401 AM CN151 AM CN554 MIDI CN555 AM CN152 61L CN4 AM CN154 DMLCD CN101 AM CN552 TWL TWR DMLCD CN803 PNL CN777 DMLCD CN701 PNR CN773 DMLCD CN703 PNL CN776 7P L 550 5P L 500 12P L 600 3P 2P 2P 2P L 70 12P L 210 4P L 230 13P L 120 5P L 230 2P L 380 2P L 410 9P L 90 3P L 100 16P L 170 7P L 170 16P L 200 6P L 320 WC601200 WG343000 WC601000 V873560 WG32410 WC60260 V8696200 WG33270 W...

Page 8: ...oldered Connector assembly BAT Black Fig 3 Fig 2 Hook A Hook A Spring Terminal 1 Lower Case Assembly Time required About 2 minutes 1 1 Remove the battery cover assembly Fig 1 1 2 Remove the nine 9 screws marked 320 and three 3 screws marked 330 The lower case assembly can then be removed Fig 1 2 Spring Terminal Time required About 2 minutes 2 1 Remove the lower case assembly See procedure 1 2 2 Re...

Page 9: ...4 minutes 3 1 Remove the MASTER VOLUME knob as shown in Fig 4 Fig 4 3 2 Remove the lower case assembly See procedure 1 3 3 Remove the TW2 connector assembly soldered to the TWL circuit board Fig 5 3 4 Remove the seven 7 screws marked 210A three 3 screws marked 210B two 2 screws marked 210C and the screw marked 210D The AM circuit board can then be removed Fig 5 3 5 Pull out the push knob from the ...

Page 10: ...e removed from the LCD unit Fig 7 5 4 Remove the LCD back light assembly and rubber connectors from the LCD panel Fig 7 When attaching the rubber connector to the LCD panel set the conductor side to face inward Fig 8 When installing the DMLCD circuit board tighten the screws 1 through 8 in numerical order as shown in Fig 9 Fig 9 If the DMLCD circuit board is replaced execute the Factory Set in the...

Page 11: ...move the two 2 screws marked 210L The TWL circuit board and speaker L tweeter can then be removed Fig 5 9 2 2 TWR Circuit Board and Speaker R Tweeter Remove the TW3 connector assembly and speaker cable soldered to the TWR circuit board and remove the two 2 screws marked 210M The TWR circuit board and speaker R tweeter can then be removed Fig 5 10 Speaker Grilles L and R Time required About 3 minut...

Page 12: ... and lift the white and black keys while pulling them toward you a little Photo 1 13 2 2 To remove the white key C6 remove the screw marked 200C unhook as described in Procedure 13 2 1 and pull out toward you Fig 12 13 3 Rubber Contacts 13 3 1 Remove the white and black keys corresponding to the rubber contacts to be removed See Fig 12 and Procedure 13 2 13 3 2 Remove the rubber contacts Photo 2 F...

Page 13: ...rews 1 through 8 in numerical order as shown in the figure for circuit board 61H in Fig 14 Fig 14 When the black keys from C 2 to A 2 from C 3 to A 3 or from C 5 to A 5 are replaced wrap the nonwoven fabric cloth WH347400 marked 380 around the black key ribs at the screw mounting portions marked 330 described in Procedure 1 Fig 15 ...

Page 14: ...n clock Port H Serial output Serial input Port H Bit clock output Word clock output Clock output Port G Ground Power supply 2 5 V Power supply 3 3 V I O port A Ground I O port B 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 V...

Page 15: ...R W E DB0 DB1 NAME Segment signal output for LCD driving Ground Oscillator Oscillator Power supply Data latch clock Data shift clock Power supply 5 V Altamated signal for LCD driver output Display data interface Read write Enable Data interface Data interface FUNCTION PIN NO 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 I O ...

Page 16: ... 8 GND 9 Y6 1 2 3 4 V 8 7 6 5 Output 1 V Input 1 VEE VCC Output 2 Input 2 Input 2 Input 1 PIN NO NAME I O FUNCTION PIN NO NAME I O FUNCTION I Master Clock Rch Analog out I Audio Serial Data Clock Rch Analog out I Audio Serial Date Input Lch Analog out I L R Clock Lch Analog out I Power Down mode Ground I Chip Select Power Supply I Control Data Input Rch Data Zero Input Detect I Control Data Input ...

Page 17: ...K 6 6 Circuit Board X7176C0 22 PNL PN 2 6 Circuit Board X7177C0 22 23 PNL PN 4 6 Circuit Board X7177C0 22 23 PNR PN 1 6 Circuit Board X7177C0 20 21 PNR PN 3 6 Circuit Board X7177C0 20 21 TWL PN 5 6 6 6 Circuit Board X7177C0 23 TWR PN 5 6 6 6 Circuit Board X7177C0 23 61H Circuit Board X2335C0 25 61L Circuit Board X2336B0 25 MIDI AMJK 2 6 Circuit Board MIDI 2NA WG23590 1 to DMLCD CN803 to WOOFER R t...

Page 18: ...0 18 DMLCD Circuit Board DMLCD 2NA WG23540 Component side to MIDI CN853 to AM AMJK 1 6 CN155 to PNR PN 1 6 CN771 not installed not installed to PNL PN 2 6 CN774 to 61L CN5 to 61H CN1 to 61H CN2 not installed ...

Page 19: ...19 KB 280 DMLCD Circuit Board Pattern side DMLCD 2NA WG23540 ...

Page 20: ...KB 280 20 PNR PN 1 6 Circuit Board PNR 2NA WG23610 1 to DMLCD CN701 Component side Component side PNR PN 3 6 Circuit Board ...

Page 21: ...21 KB 280 PNR PN 3 6 Circuit Board PNR PN 1 6 Circuit Board PNR 2NA WG23610 1 Pattern side Pattern side ...

Page 22: ...KB 280 22 PNL PN 2 6 Circuit Board PB 2NA WG23590 1 PNL 2NA WG23610 1 to DMLCD CN703 PITCH BEND PNL PN 4 6 Circuit Board PB AMJK 6 6 Circuit Board Component side Component side Component side ...

Page 23: ...2 6 Circuit Board PNL PN 4 6 Circuit Board Component side Pattern side TWL TWR PN 5 6 6 6 Circuit Board Pattern side Pattern side PNL TWL TWR 2NA WG23610 1 TWL to AM AMJK 1 6 CN553 TWR to MIDI AMJK 2 6 CN556 to TWEETER ...

Page 24: ...rcuit Board to BACK LIGHT to DMLCD CN101 to TWL PN 5 6 6 6 to BATTERY to WOOFER L DC IN 12V PHONES OUTPUT EXPRESSION MASTER VOLUME STANDBY ON AM AMJK 4 6 Circuit Board AM AMJK 5 6 Circuit Board Component side Component side AM 2NA WG23590 1 ...

Page 25: ...25 KB 280 to DMLCD CN401 to 61L CN4 to DMLCD CN403 A A A A B B to DMLCD CN402 to 61H CN3 B B 61H Circuit Board 61L Circuit Board Component side Component side 61H 2NAKB V869540 61L 2NAKB V869520 ...

Page 26: ...STER VOLUME to the maximum level and check the output level PHONES L 4 5 dBu 2 dB PHONES R 55 0 dBu or less 1 Preparations 1 Use an AC adaptor PA 5D PA 51 2 Measuring device Frequency counter which can detect thousandth value or more Level meter with JIS C filter Note Use a stereo plug and connect a load resistor of 33Ω to the PHONES OUTPUT jack for measurement unless otherwise specified Input imp...

Page 27: ...ximum position UP Make sure that PB OK is displayed on the LCD 15 Connect the Exp pedal to the Exp PEDAL jack Press the START STOP button to start the test and make sure that C3 is played when the pedal is depressed On and that C4 is played when the pedal is released Off Make sure that Exp OK is displayed on the LCD 16 Connect the MIDI IN terminal and MIDI OUT terminal with a MIDI cable and then e...

Page 28: ... A 3 B3 C4 C 4 D4 D 4 E4 F4 F 4 G4 G 4 A4 A 4 B4 Switch test item list Turn SW Name LCD Display Note Number 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Strings Violin SweetFlt Clarinet Oboe Sweet Tp Fr Horn BrasSect Harp SquareLd ClasGtr Aco Bass SFX Kit1 ACMP ON SYNC STOP SYNC START INTRO Str Stp Main A Main B Memory Bank Regist 1 Regis...

Page 29: ...KB 280 29 INITIALIZATION Clr Frash ...

Page 30: ...0 24 semi o 0 24 semi 0 32 o o Bank Select 1 11 x 1 o 5 65 84 o o 6 38 o o Data Entry Control 7 10 o o 64 o o Sustain Change 71 74 x 1 o Sound Controller 91 93 o o Effect Depth 96 97 x 1 o RPN Inc Dec 100 101 o o RPN LSB MSB Prog o 0 127 o 0 127 Change True System Exclusive o o Song Pos x x Common Song Sel x x Tune x x System Clock o o Real Time Commands o o Aux All Sound OFF x o 120 126 127 Reset...

Page 31: ...KB 280 31 MIDI DATA FORMAT ...

Page 32: ...and must be replaced with parts having specification equal to those originally installed The numbers QTY show quantities for each unit The parts with in PART NO are not available as spare parts This mark in the REMARKS column means these parts are interchangeable The second letter of the shaded part number is O not zero The second letter of the shaded part number is I not one ...

Page 33: ...80 160 190 260 210 210 210 270 270 270 370 110 200 210 210 210 210 370 380 370 210 140 130 280 210 210 210 210 210 290 360 350 20 50 30 150 270 270 120 150 90 U40 U40 U40 U40 U40 U40 U30 U10 U40 U20 300 Lower case assembly See page 6 LCD Unit Battery cover assembly 280a 280b Wheel assembly Upper case assembly 180 250 250 190 OVERALL ASSEMBLY ...

Page 34: ... 280a Wheel 03 280b Spring 03 290 Circuit Board PB 300 Grease G 31KA 50g VE96850 10 310 Lower Case Assembly WG07410 320 Bind Head Tapping Screw B 3 0X12 MFZN2W3 9 01 330 Bind Head Tapping Screw B 3 0X30 MFZN2W3 3 01 340 Battery Cover Assembly PT 03 340a Battery Cover V704220 340b Battery Cushion White V710060 3 340c Cushion PE V796870 2 340d Nonwoven Fabric Cloth 15X3X0 5 V925980 6 340e Cushion PE...

Page 35: ...0 4 New Parts REF NO PART NO DESCRIPTION REMARKS QTY RANK RANK Japan only L110 Nonwoven Fabric Cloth 5X8 V706870 2 ACCESSORIES Music Rest AC Adaptor PA 5D CHN 08 EXP Pedal EP 1 KAI VP62250 WG073800 WF324900 ...

Page 36: ...y 16N 5 06 50 Rubber Contact 16N 2M OCT 2M C1 B1 C2 B2 C3 B3 C4 B4 4 04 60 Rubber Contact 16N 2M 13K 2M C5 C6 04 150 MK Circuit Board Assembly 16N2M C61 P2 V869560 150a Circuit Board 16L V869520 X2336B0 04 150b Circuit Board 16H V869540 X2335C0 04 150c Connector Assembly 16N 2M C61 L 210 01 150d Felt U 02 160 Felt L 02 170 Rubber Support 16N 03 180 Bind Head Tapping Screw B 3 0X8 MFZN2W3 7 01 190 ...

Page 37: ...0 220 60 60 170 170 180 200 200 210 220 110 130 170 170 120 120 10 20 L60 L30 L20 L30 L20 L30 L20 L70 L60 L10 L40 Keyboard assembly See page 5 Speaker box R assembly Speaker box L assembly Lower case sub assembly 230 170 170 170 LOWER CASE ASSEMBLY ...

Page 38: ...BLACK V873560 170 Adhesive Tape 12X50 11 03 170 Adhesive Tape MY7 12X50 WB79380 11 180 Speaker Box R Assembly RIGHT 05 190 Speaker Box L Assembly LEFT 05 200 Bind Head Tapping Screw B 4 0X10 MFZN2W3 40 01 210 Speaker 12 0cm 4ohm 6W WOOFER 2 06 220 Connector Assembly SPL 2P WG32410 2 230 Adhesive Tape FILAMENT 12X70 03 230 Adhesive Tape MY7 12X70 WB79390 Lower Case Sub Assembly L10 Lower Case WG073...

Page 39: ... J FORM VP75920 110 Rotary Variable Resistor TOKU 20K RK24311L0 VP59510 120 Cord EXP VP88910 130 Flat Washer 6X11 5 0 8 MFZN2BL 01 140 Hexagonal Nut M6 3 2 150 Flat Spring Washer 1L 6 0 MFZN2BL 4 01 160 Grease G 30H 0412108 190 Flat Washer 6 0X16X1 0 MFC2BL 2 01 200 Name Plate EP 1 VL64520 210 VR Holder EP 1 VP60750 220 Bind Head Tapping Screw P 3 0X8 MFZN2W3 3 01 230 Bind Head Tapping Screw C 3 0...

Page 40: ...RX TP 01 C562 Electrolytic Cap 10 00 50 0V RX TP 01 C563 Mylar Capacitor 0 0470 50V J RX TP 01 566 Mylar Capacitor 0 0470 50V J RX TP 01 C569 Electrolytic Cap 47 00 16 0V RX TP 01 C569 Electrolytic Cap 47 00 16 0V TP C570 Electrolytic Cap 47 00 16 0V RX TP 01 C570 Electrolytic Cap 47 00 16 0V TP C571 Semiconductive Cera Cap 0 1000 25V Z TATET 01 C851 Ceramic Capacitor F 0 0100 50V Z RX TP 01 C851 ...

Page 41: ...26 01 559 Flame Proof C Resistor 2 2 1 4 J TE 26 01 R560 Carbon Resistor 100 0 1 6J 26TP R561 Carbon Resistor 100 0 1 6J 26TP R562 Carbon Resistor 330 0 1 6J 26TP R563 Carbon Resistor 330 0 1 6J 26TP R851 Carbon Resistor 10 0K 1 6J 26TP R852 Carbon Resistor 15 0K 1 6J 26TP R853 Carbon Resistor 4 7K 1 6 J 26TP R854 Carbon Resistor 1 0K 1 6 J 26TP R855 Carbon Resistor 220 0 1 6J 26TP R856 Carbon Res...

Page 42: ...ctrolytic Cap chip 10 16V 01 C503 Ceramic Capacitor F chip 0 1000 25V Z RECT 01 C504 Electrolytic Cap chip 10 16V 01 C505 Ceramic Capacitor F chip 0 1000 25V Z RECT 01 C506 Ceramic Capacitor F chip 0 1000 25V Z RECT 01 C507 Ceramic Capacitor B chip 1500P 50V K RECT 01 C508 Ceramic Capacitor B chip 1500P 50V K RECT 01 C509 Ceramic Capacitor SL chip 560P 50V J RECT 01 512 Ceramic Capacitor SL chip 5...

Page 43: ...14 Carbon Resistor chip 100 0 63M J RECT 01 R315 Carbon Resistor chip 47 0 63M J RECT 01 R316 Carbon Resistor chip 47 0 63M J RECT 01 R401 Carbon Resistor chip 100 0 63M J RECT 01 R402 Carbon Resistor chip 100 0 63M J RECT 01 R501 Carbon Resistor chip 0 63M J RECT 01 R503 Carbon Resistor chip 4 7K 63M J RECT 01 514 Carbon Resistor chip 4 7K 63M J RECT 01 R515 Carbon Resistor chip 100 0 63M J RECT ...

Page 44: ...able Holder 51048 16P TE 01 CN774 Cable Holder 51048 16P TE CN775 Cable Holder 51048 6P TE 01 CN775 Cable Holder 51048 6P TE 01 CN776 Cable Holder 51048 6P TE 01 CN776 Cable Holder 51048 6P TE 01 CN777 Wire Trap 52147 3P TE 01 D771 Diode 1SS133 1SS176 TE 01 775 Diode 1SS133 1SS176 TE 01 D771 Diode 1N4148 DO 34 01 775 Diode 1N4148 DO 34 01 LD751 LED TL 20346D R F 13 5 VOICE B LD752 LED TL 20346D R ...

Page 45: ...KB 280 14 New Parts REF NO PART NO DESCRIPTION REMARKS QTY RANK RANK Japan only Speaker 3 0cm TWEETER 2 01 Speaker 12 0cm 4ohm 6W WOOFER 2 06 LCD X0159A00 X5163A00 WF817100 ...

Page 46: ...16 15 46 89 119 24 47 66 90 120 4 VDD IOVDD 5 13 PF0 LED LED LED LED 5D RESET 3 6V 50ms B01 B07 B07 B11 SW37 61 SW1 36 PC0 5 PD0 5 PC0 5 PD0 5 TOUCH RESPONSE Keybord 61KEY 16N SD0 PC7 32 40 41 67 68 123 32 34 36 42 44 117 SDI IC402 16P IC301 128P IC801 10P IC501 16P IC601 80P TR705 TR701 704 IC502 8P IC103 3P IC102 3P IC101 3P IC151 3P LD751 LD752 SW771 VR751 SW746 770 LD753 IC551 14P VR551 IC207 ...

Page 47: ...UTPUT BA33BC0FP X5889A00 REGULATOR 3 3V DMLCD IC102 1 2 3 1 INPUT 2 GND 3 OUTPUT DTC123JKA VY677600 DIGITAL TRANSISTOR DMLCD TR705 1 GND 2 IN 3 OUT 1 3 2 OUT R1 R2 GND IN IN GND OUT RH5RZ50CA T1 F X6959A00 REGULATOR 5V DMLCD IC101 1 2 3 1 GND 2 INPUT 3 OUTPUT 1 2 3 3 OUTPUT 2 GND 1 INPUT BA60BC0T X6980A00 REGULATOR 6V AM IC151 DMLCD xx STANDBY ON REGULATOR 5V REGULATOR 6V POWER AMP 13 5W ROM 128M ...

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